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Purification method of phosphoric acid

A technology of phosphoric acid and phosphoric acid solution, which is applied in the field of phosphorus chemical industry, can solve the problems of low acid purity and high content of anion impurities, and achieve the effects of simple process, good product quality, and easy operation and control

Active Publication Date: 2010-09-01
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purification mechanism of the two is the same, so the Japanese patent JP53096994 still has the defect that the purity of the obtained product acid is not high (especially the high content of anion impurities), and only products equivalent to industrial grade phosphoric acid can be obtained

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Examples

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Embodiment 1

[0067] Decompose Guizhou Fuquan phosphate rock with sulfuric acid to separate gypsum to obtain wet-process phosphoric acid, which is used as raw acid for electrodialysis. Adopt a three-chamber electrodialysis device assembled according to cathode plate (cathode chamber) → positive membrane → intermediate chamber → negative membrane → anode chamber (anode chamber). The positive membrane uses polyethylene homogeneous cation exchange membrane, and the negative membrane uses polyethylene homogeneous anion exchange membrane. Add 400 grams of ultrapure water to the intermediate chamber, respectively add 900 grams of raw material phosphoric acid to be treated in the cathode chamber and the anode chamber, and its concentration is 25.52% (in P 2 o 5 count). Electrodialysis was performed under a DC power supply. Working current density 1.25A / dm 2 , the working voltage is 3V, the temperature of the liquid phase system is controlled between 25°C, and the electrodialysis operation time...

Embodiment 2

[0069]Decompose Guizhou Fuquan phosphate rock with sulfuric acid to separate gypsum to obtain wet-process phosphoric acid, which is used as raw acid for electrodialysis. A three-chamber electrodialysis device assembled by cathode plate (cathode chamber)→cation membrane→intermediate chamber→cathode membrane→anode chamber (anode chamber) is adopted. Polyethylene homogeneous cation exchange membrane is used for the positive membrane, and polyether homogeneous anion is used for the negative membrane. exchange membrane. Add 400 grams of ultrapure water to the intermediate chamber, respectively add 900 grams of raw material phosphoric acid to be treated in the cathode chamber and the anode chamber, and its concentration is 25.52% (in P 2 o 5 count). Electrodialysis was performed under a DC power supply. Working current density 1.25A / dm 2 , the working voltage is 3V, the temperature of the liquid phase system is controlled between 25°C, and the electrodialysis operation time is 3...

Embodiment 3

[0071] Decompose Guizhou Fuquan phosphate rock with sulfuric acid to separate gypsum to obtain wet-process phosphoric acid, which is used as raw acid for electrodialysis. A three-chamber electrodialysis device assembled by cathode plate (cathode chamber)→cation membrane→intermediate chamber→cathode membrane→anode chamber (anode chamber) is adopted. Polyethylene homogeneous cation exchange membrane is used for the positive membrane, and polyether homogeneous anion is used for the negative membrane. exchange membrane. Add 400 grams of ultrapure water to the intermediate chamber, respectively add 900 grams of raw material phosphoric acid to be treated in the cathode chamber and the anode chamber, and its concentration is 25.52% (in P 2 o 5 count). Electrodialysis was performed under a DC power supply. Working current density 1.25A / dm 2 , the working voltage is 3V, the temperature of the liquid phase system is controlled between 25°C, and the electrodialysis operation time is ...

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Abstract

The invention relates to a purification method of phosphoric acid, which belongs to the technical field of phosphorous chemical industry. The technical problem to be solved by the invention is to improve the purity of the phosphoric acid, effectively remove impurities of anions and cations and obtain high-purity acid for preparing industrial-grade or food-grade phosphoric acid. The technical scheme of the invention is as follows: the purification method of the phosphoric acid adopts the three-chamber electrodialysis method and comprises the following steps: adding phosphoric acid solution to be purified in an anode chamber, adding acid solution in a cathode chamber, and adding ultrapure water or diluted phosphoric acid in an intermediate chamber; and carrying out electrodialysis under the action of a direct current electric field, leading phosphate radicals in the anode chamber to pass through an anion exchange membrane and enter into the intermediate chamber, leading hydrogen ions in the cathode chamber to pass through a cation exchange membrane and enter into the intermediate chamber, and finally obtaining the purified phosphoric acid in the intermediate chamber. The method can separate the phosphoric acid from impurities through the action of the attraction force of the electric field, the concentration difference diffusion and the selective permeability of the anions and the cations and obtain the purified phosphoric acid in the intermediate chamber, the process is simple, and the obtained product has good quality, thereby providing the new process for purifying the phosphoric acid.

Description

technical field [0001] The invention relates to a method for purifying phosphoric acid, which belongs to the technical field of phosphorus chemical industry. Background technique [0002] At present, the preparation methods of phosphoric acid mainly include wet method and thermal method. Due to the high impurity content of wet method phosphoric acid, most of them can only be used to manufacture low-grade phosphate products such as phosphate fertilizers, food grade and electronic grade phosphoric acid and fine phosphate The product is mainly prepared by thermal acid, but compared with wet acid, thermal acid consumes more energy and has higher production costs, so researchers try to use various methods to purify wet phosphoric acid, and use this as raw material to produce Production of low cost fine phosphate products. At present, the purification methods of wet process phosphoric acid mainly include crystallization method, ion exchange method, chemical precipitation method, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/237B01D61/46
Inventor 李进李光明邹建袁海斌唐文军
Owner GUIZHOU CHANHEN CHEM CO LTD
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